A Doppler effect occurs when a source of sound moves
A)towards you.
B)away from you.
C)either towards you or away from you.
D)in a circle around you.

Question

Quizplus · Accepted Answer

The Doppler effect can occur when a source of sound is either moving towards or away from an observer, or vice versa. It can also occur when both the source and observer are in motion relative to each other. However, the Doppler effect does not occur when the source of sound is moving in a circular motion around the observer as the distance between them does not change.

A Doppler Effect Occurs When a Source of Sound Moves